US1560272A - Combination pressure and vacuum valve - Google Patents

Description

Patented Nov.- 3, 1925.

UNITED lsTA'rlSs Prrlazla'rl oFFlcE.

Roianm' J. noAUsLAND, or OKLAHOMA crr'z,d oxmom COMBINATION PRESSURE v-`AND VACUUM VALVE.

Arpication filed February 19, 1923. Serial No. 619,929.

To all, whom #may concern.:

-Be it known that I, ROBERT J. MoAUs- LAND, a citizen of the United States, residing at Oklahoma City, in the county of Oklahoma and State of Oklahoma, have invented a certain new and useful Improvement in Combination vPressureJ and Vacuum Valves,

of which the following is a specication, reference being hadto the accompanying drawings.

`My invention lrelates to improvements in combination pressure and vacuum valves for preventing fluids from escaping from tanks gas, and automatically permit the entrance.

of air into the tank.

The object of the invention is to provide a device of this character which will be simple 'and inexpensive of construction, which may be quickly and easily applied and removed, which lwill automatically shift from a pressure to afvacuum valve, have freeness and looseness oi valve action so as not to become fastened, and which will be exceedingly eiective in accomplishing its intended purpose.

With the above and other objects in view my invention further consists in the novel features of construction and combination and arrangement of parts hereinafter def@ scribedv and claimed, and illustrated inthe one sheet accompanying drawings, in which, I Figure 1 is,a one-half sectional view of a prtion of Fig. 2 on a line shown Atrom A to v f Figure 2 is a section view of the com bined pressure andl vacuum valve.

Figure 3 is a reduced section view vof a portion of Fig. 2` showing an additional method of using the weights when desired.

Figure 4 is a reduced section` view show-v ing a part of the top portion of Fig. 2 and the connection forjsaving as. j Like characters, of re erence designate like parts in all figures..

' As stated the lnvention relates to improvements 1n combination pressure and vacuum valves, and consists of a casing 3 of any suitable metal, preferably" cylindrical having a helically threaded opening 4 in the bottom into which fits a pipe 1, 2, helically threaded.

This pipe is adapted to, connect the device with the top of `a suitable receptacle (not shown) adapted to contain volatile liquid.

The outer casing above ,the shoulder hereinbelow further described has an opening 7 ora pluralitythereof, extending downwardly and outwardly, covered by a hinged closure 7a. The opening, or a plurality thereof, must be of as great capacity as the intake pipe l so as to insure the carrying off of any overflow from the tank or receptacle, when required. The cylindrical wall ofthe casing has a helically threaded opening ata pointbelowr the shoulder adapted for connection with a suitable manometer,

not shown, which when not so connected is' closed by a similarly threaded plug 5 with square-headed outer portion for tightening l and loosening. v

A removable cap 39 on the top of the'device and downwardly liared edges 40, 41, protect it from the elements, dirt and weather and securely holds the screen 35 in place,

and is fastened to the flange 8 by screwthreaded bolts 42 and 43 in holes in the standards 36, 37. It has also the member.

38 intended to prevent the pressure valve from injuring the screen 35 by pushing it entirely out.

The casing near 1ts central portion has an inwardly extending radial shoulder, the perpendicular inside edge of the ring of which is helically threaded as at 6 to t a similarly threaded part of a gasket forming a seatcarrying portion for' the pressure valve and consisting of the members 13, 17, 21, 22, 23, and 24 with openings 14, l5, 16 to permit the escape of gas from the tank `when the pressure is too great. On said seat-carrying portionin the upper part of the inside of said device normally rests the pressure valve, with wing-shaped lobes 18, 19, 20f-to more easily screw the seats 27 and 28 into place and guide the valve which includes the members 18, 19, 20, 25, 26, 27, 28 31 and 34 back to normal position after being tilted or lifted for escape of gas or fluids, and allow free passage of gas through the channels and yet prevent binding to the sides in closing. The gaskets or seats 27 .and 28 may be made of lead, bronze, rubber, libre or other suitable material.

In the pressure valve the top 34 is rounded to prevent contact with the member 38 thereabove from breaking or injuring the screen 35. The lead weights 32, 33 are curved or shaped to permit of easy movement and free return to its usual position. It will be observed guides 25, 26, do not eX- tend to the inside of the outer casing but permit of the easy movement and ret-urn to place of the valve .and also the escape of gases between them and the 'outer walls of 9, 10, 11 #and 11a formed as shown on a line A-A. At 11 is shown a screen held in' place by screw bolts 11 connecting the 'two semi-circular portions and allowing thc free ingress of air from outside the device. In-l side said last described portion is a cylindricallyshaped seat 52 the outer edge of which is helically threaded to fit a similarly threaded surface in the upper portion of said last described semi-circular formation. On top of said seat 52 is a vacuum valve with wing-shaped lobes 44, 45, 46 on its lower side, and wing- shaped lobes 49, 50, 51 `on its upper side and a gasket of fibre 47 or other suitable material and a metal portion 48 between said upper and lower wingy shaped lobes. v

At 53, 54, 55 is shown a modified form of the application of a weight when desired.

At 56, 57,58 is shown a modified form of a top for the device.

When the pressure of the gases arising from the fluid in the tank is greater than should be allowed the gases ascend1 upwardly from the passage 1 and varise on the outer surface of the member 9 up to and through the holes 14, 15, 16 etc. land afrainst the lower portion of the pressure va ve in the upper part of the device, and when suiiiciently strong, either raise bodily or tilt one or the other side of said pressure valve, thereby permitting theescape of ysaid gases thro-ugh the aperture under the seats 27 and 28 as shown by the arrows 29, 30, and -on through the screen 35, into the open air at the top of the device.

As soon as the gases have escaped suiiciently to relieve the danger from the tank the .weight of the pressure valve and its weights 32 and 33, causethe pressure valve to resume its former seat, thereby shutting of any further escapeof the gas until recurrence of similar conditions.

If the withdrawal of the liquid causes a partial vacuum in the tank the suction of the air into the device through the screen 11 and the chamber formed by the members 9 and 10 (more plainly shown in Figure 1) will cause the lifting or tilting' of the vacuum valve composed of the members 44,

45, 46, 47, 48, 49, 50, :and 51 and cause the air to be drawn throu h the aperture occasioned by the lifting or. ilting as shown 'by the arrows 59 and 60. As soon as sufiifurther ingress of the air to the tank.

From the description of the accompanying drawing and specification the advantages of making, constructing, operating and applying the device will be apparent to those skilled in the art to which my invention pertains; but it will be -understood that any modifications within the scope of the claimed invention may be made in the construction and combination f parts without departing from the prinicpile of the invention or sacrificing any of 1 s advantages.

Having thus described th invention what is claimed, and desired to besecured by Letters Patent is: .f

1. A pressure and vacuum valve comprising a casing including pressure and overflow chambers, the latter having a screened outlet communicating with the atmosphere, said casing having an intermediate wall, a cylindrical member mounted in said wall and provided with a valve seat, a pressure valve cooperating with said seat adapted to open due to increased pressure of gases in the pressure chamber, 'and means for carrying off the overflow.

2. A pressure and vacuum valve comprising a casing including pressure and overiow chambers, the latter having a screened outlet communicating with the atmosphere, means including a pressure. valve and seat intermediate the two chambers, the pressure valve adapted to open upon increased pressure `of gases ascending into the pressure chamber, means for carrying off the overflow, means including a vacuum valve and seat and an air supply to the pressure chamber, whereby air may be drawn into the pressure chamber to overcome a vaccum therein. v

' 3. A pressure and vacuum valve compris ing a` casing. including pressure and overflow chambers, the latter having an outlet communicating with the atmosphere, means communicatingly connecting the two chambers including a valve seat and a pressure valve, the valve adapted to open upon an increase of gases in the. pressure chamber, means to carry off the overflow, an air chamber within the pressure chamber and having a screened openingfor permitting,I air to enter the air chamber, means incluiing a valve seat and a vacuum valve cooperating with the seatfor controlling coinmunication between the air chamber and the pressure chamber, allowing air to enter the pressure chamber when a vacuum is created therein.

4. A pressure and vacuum valve comprising a casing including pressure and oveiflow chambers, the latter having an outlet communicating with the atmosphere, means communicatingly connecting the two chambers including a valve seat and a pressure valve, the valve adapted to open upon an increase of gases in the lpressure chamber, means to carry off the overflow, an air ehanienter the air chamber, means including a valve seat and a vacuum valve cooperating with the seat for controlling communication between the air chamber and the pressure chamber, allowing air to enter the pressure chamber when a vacuum is (f1-euml therein, and means depending from the intermediate portion of the casing for guiding the vaeuuunvalve in raising and reseating itself.

ROBERT J. BIC/AUSLAND.

Images